Direct memory access for data transfer within an I/O device

Details Direct memory access for data transfer within an I/O device Direct memory access for data transfer within an I/O device

1993-05-24

1995-06-20

Harvey, Jack B.

Boots, shoes, and leggings

395425, 364DIG1, 3642382, 3642383, 3642384, 3642395, 364240, 3642423, 3642435, 3642455, G06F 1300

Patent

active

054267374

ABSTRACT:
Within a computing system an input/output device connects an input/output bus to an external data port. Data is transferred between the input/output bus and the external data port. A controller within the input/output device transfers data between the external data port and an internal memory. Direct memory access circuitry within the input/output device transfers data between the internal memory and the input/output bus in synchronization with data transfer across the input/output bus. Data transfers to and from the internal memory are arbitrated so that the controller does not transfer data between the external data port and the internal memory simultaneous to the direct memory access circuitry transferring data between the internal memory and the input/output bus.

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